As far as your very last question, you are correct. But battery capacity will, of course, impact how soon you need to recharge when you are doing whatever you are doing with the BlackBerry.

The BlackBerry isn't the first device you would choose if listening to music is among your top criteria for a smartphone. But you need to test drive a demo unit, if you can. It may not be the best, but it may be adequate for you. Make a list of your top 5 must haves in a smartphone and find the one that best meets your top 3 and at least provides adequate performance on the last two of the five.